My network is extremely slow and some pages won't load. Why?

Some internet connections have a sub-1500 MTU but don't support automatic MTU path discovery. It is worth a try to manually change MTU on the config->interfaces->edit page to something lower, 1492 or even 1450, to see if it has any effect. You must be in advanced mode to change this setting.
http://wiki.untangle.com/index.php/N...t_load._Why.3F